Jack for lifting concrete forms



July 28,1925. n, 1,547,975

' L. Q. THINGSTAD l JACK FOR LlTlNG COQYCRETE FORMS L. ars l aen Thms'l'ad July, 28, 1925. 1,547,975

L. O. THINGSTAD JACK Fon LIFTING CONCRETE FORMS 'Filed .my 21. .1924 2 sheets-sheet 2 Patented July 28, 1925.

LARSs OILSEN rIIINGsTAD, or rom* WILLIAM, ONTARIO, CANADA.

JACK Fon LIF'II'NG CONCRETE FORMS.

Application filed July 21, 1924. Serial No. 727,363.

To all whom t may concern.'

Be it known that LAns O. THiNGsTAn, a subject of the King of Great Britain, residing at Fort IVilliam, in the Province of Ontario and Dominion of Canada, 'have invented certain new and useful Improve- Inents in a Jack for Lifting Concrete Forms,`

of which the following is a specification.

This invention relates to improvementsv in jack structures particularly well adapted for lifting of concrete forms.

An important feature of the invention is the provision of a jack of the above nnentioned character which operates on a novel principle, which-is more efficient than the ordinary screw principle of jack operation heretofore employed in the elevation of con-- crete forms. v

Among the important advantages served by the use of the improved jack in connection with elevation of concrete forms are the prevention of slipping; reduction of labor; well balanced maintenance of the concrete forms and jack structure; its extreme durability incident tor thelocation of the same upon the frame portion thereof; and the efficiency in operation thereof, therer being no jack backing necessary with. the use of the improved jack structure as herein-A after described. Y Y I Other objects and advantages of the invention will, of course, be apparent from the following description and from the drawings.

In the drawings wherein for the purpose of illustration is shown only a preferred Aembodiment of the invention* l Figure 1 shows the use of the improved jack upon a concrete wall, showing the relation of details thereof for the elevation of a form. Y l

Fig. 2 is a viewv similar to the view illustrated in Figure 1, showing a differentposition of the form with respect to a concrete wall.

Fig. Bis' a fragmentary side elevation of forms of a silo or elevator or other structure.

Fig. 6 is a fragmentary cross'sectional view taken through the joint of a pair of sections' of a novel jack rod employed in connect-ion with the elevation of the jack and concrete forms. v

'In the` drawings, wherein similar reference characters designate corresponding parts throughout the several views, the lettei-'A may generally designate the improved jack structure which vmay consist of a frame B adaptedkto have the'concrete form C lixedly connected thereto. It furthermore includes a novel operating mechanism DV carried by the frame B for cooperation over a Jack rod E, the latter being carried by and fixed with the concrete -wall or structure F being built between the forms C.

Jacks of the character herein described are used for elevating the concrete forms of astructure being built, after a section of thestructure has been built, in order to fill in the forms for the production of another section of the concrete' structure. In this manner lthe forms are successively elevated by means ofthe jacks to the desired height of the building structure, it ofcourse'being understood that any suitable arrangement of joists and "ooring' aresupported at the tops of the jack structures, and 'which flooring is likewise elevated as the jacks are raised upon the completed building structure.

In the improved jack A the frame is` preferably of a novel type, including the side legs 15 and 16, preferably formed of heavy timber, and which are connected by means ofa cross piece 17 at the top thereof, so that they v'are normally in parallel relation.` The cross piece 17 is preferably of metal, including a channel shaped 'body portion 18 having the depending saddle flanges 19 and '20 at each end thereof, to provide pockets 21 and 22 within which the upper ends of the legs 15 and 16 are received and bolted, as at 24. The wall of the `body portion 18 is preferably provided with an opening 30 through which the rjack rod E slidn ably extends.

The form' structure C `.preferably comprises the 'spaced' form plates or walls 35 and 36, which are .connected between theV legs 15 and 16v of the frame B in any suitable manner. A preferred manner of connecting these form plates 35 and 36 consists in the provision. of auxiliary leg pieces 38 and 39 which are clamped to the facing sides of the legs 15 and 16, respectively, by means of bolts 40 transversely extending therethrough. These bolts 40 also support angle pieces 41 at the inside facing surfaces of the auxiliary or reinforcing leg pieces 38 and 39, and which clips 41 support filler pieces 42, which when the structure being built is a silo or grain elevator and cylindrical in formation, will be segmental, and the form walls 35 and 36 will be segmental or cylindrical, and connected to the segmental filler pieces 42, or connected in any other approved manner to the frame structure. It is to be noted that the form walls 35 and 36 are supported between the legs 15 and 16 in spaced relation below the cross piece 17 of the U-shaped frame B, and in the space between the concrete form C and the cross portion 17 the operating mechanism D is supported on the legs 15 and 16, between the ends of the latter, and in which location the means D serves the very desirable purpose of reinforcing the frame B to prevent the spreading of the legs 15 and 16 thereof.

Referring to the structure of the jack rod E, the same is preferably formed in sections, and may be polygonal in cross section with teeth 50 and 51 arranged along opposite sides thereof; each of which teeth 50 and 51 provides a horizontal top shoulder 52 and a sloping side surface 53 reaching to the next lowermost shoulder 52 of the tooth immediately therebelow. The jack rod L referabl beinO formed in sections it is )referred to provide a non-slip joint connection which consists of a pin 55, preferably carried in a socket opening 56 in the top section 57, as is illustrated in Figure 6 of the drawing, which is adapted to be inserted in a socket opening 58 of a lower section 59, in order to connect the sections 57 and 59. It may be stated at this time that the rod E is embedded in the concrete wall structure F, as the same is completed, and additional sections of the rod E are superposed upon the embedded sections in order to provide for the elevation of the jack structure and the forms therewith, so that the back j acking7 is not necessary.

Referring to the improved operating means G, the same may include a frame 65, consisting of bracket castings 67 and 68, respectively connected with the legs 15 and 16 of the frame B, and including also side plates 70 and 71 connected with said brackets 67 and 68. The brackets 67 and 68 are of identical construction, and are of very strong durable material, including the U- shaped channel portions 74 providing poc-kets 75 adapted to receive the legs of the frame B therein. From the U-haped .channel portion an attaching flange 77 extends from each of the brackets 67 and 68, which attaching flanges 77 are in facing relation nels 74 are of course bolted to the legs of the frame B by transverse bolts 83 and upper and lower flanges are bolted to the legs by bolts 82 arranged transversely to bolts 83, substantially as is illustrated in Figures 3 and 4 of the drawings, so that the frame 65 is supported crosswise of the frame B, between the legs 15 and 16 of said frame B, and between the plates 70 and 71 providing a compartment adapted to receive the operating details of the means D.

lVithin the compartment 85 between the walls 70 and 71, are loc-ated slide plates or members 88 and 89, at opposite sides of the jack rod E, the latter extending through the compartment 85 intermediate the frame legs 15 and 16. These plates 88 and 89 are held in position by side pieces or filler blocks 92 and 93, respectively, said guide blocks being bolted, as at 94, to the plates 70 and 71 so that the members 88 and 89 have their outer edges in sliding contact against the edges 95 of said filler blocks, and so that spring urged dogs 97 and 98 which are respectively carried by the plates or members 88 and 89 are urged at their pointed ends into engagement with the notched sides of the ack rod E. Each of these dogs 97 and 98 at their free ends is urged into such relation by means of springs 99 carried within the respective slide plates 88 and 89.

The movable members 88 and 89 upwardly therein are preferably provided with the square or rectangular shaped openings 101 and 102 respectively, receiving blocks or pieces 103 and 104 respectively, slidable horizontally in said openings 101 and 102, although being prevented from upward movement in said spaces, for a reason which will be, subsequently set forth. Thus, the top and bottom edges of the pieces 103 and 104 are in sliding contact with the upper and lower edges of the openings 101 and 102, although there are clearances between the side edges of the pieces 103 and 104 and the openings in which they are respectively disposed. Oil ducts 106 may lead into the openings 101 and 102 for the purpose of lubricating the bearing surfaces of the blocks 103 and 104 in the openings in which they move. The pieces 103 and 104 are just slightly less in thickness than the thickness of the members 88 and 89 in which they slide, and are respectively provided with circular openings 110 and 111 therethrough. Shafts 114 and 115 are carried on horizontal axes in parallel relation by means of bearing blocks 116 carried by the frame plates 70 and 71; said shafts 114 and 115 thus being rotatable about axes which are fixed with respect to the plates 70 and 71, and said Vshafts respectively having cams or eccentrics 118 and 119 respectively thereon which operate within the openings 110 and'111 of the pieces 103l and 104. The shafts 114 and 115 respectively' have gears 120 and 121 thereon which are in iiitermeshing relation, so th'atthefshafts are' synchronously operated. It is preferred that the forwardly projecting end of thev frame 65 below the sliding' members 88 and` 89. Springs 130 are preferably provided, each connected at its ends to the free swinging ends of the detents 125 and 126 for normally urging the detentsat their free ends into engagement with the notched sides of the jack bar E. These detents are provided as a means of preventinor slipping of the operating mechanism and the 'jack structure. f

Referring to the operation of the jack,

after the forms C have been filled with ce-A be moved back and forth in their openings' 101 and 102, and incident to their connection with the members 88 and 89 'said Vmembers will be elevated, carrying the'dogs 97 and 98 therewith, which slide over the notches or teeth and 51, preventing return movement of said dogs. Due to the movable sliding of the plates 88 and 89 in vertical manner with respect to the frame plates 70 and 71, the frame is elevated upon operation of the lever 124, Vand the connected jack frame B therewith. v

Various changes in the shape, size, and arrangement of' parts may be made to the forni of the invention herein shown and described, without departing from the spirit of this invention or the scope vof the claims.

I claim:

1. 1n a jack structure of the class dey scribed a frame, a jacl; rod, a vertically movable member in the frame adJacent the jack rod, a dog carried by said member normally urged into engagement with the jack rod, a

shaft carried by said frame, and means providing an eccentric connection of the shaft with said movable member whereby upon oscillation to move the movable member and the dog therewith along said jack rod.

H2.1n ak jack of the class described a frame, a jack rod having teeth on a side thereof, ar sliding plate in the frame, a spring urged dog carried by the sliding plate engaging the teeth of said jack rod, a shaft bearing in said frame, a block' movable` transversely in said `sliding plate, and an eccentric on said shaft operating in said Y block whereby upon rotation of the shaftthe plate and dog therewith may be moved relative to the frame for velevating the latter upon said jack rod'.

3. In a jack a frame, a stationary jack rod having teeth at opposite sides thereof, dogs for lthe lteeth at the opposite sides of said red, means engaging said'teeth in relative movable relation 'within the' frame, and ec.- centric means in the framel operating within said last mentioned means.

4.111 a jack structure a frame, a jack rod extending into the frame, said rod having Vteeth at opposite sides thereof, sliding plates'disposed for'vertical movement at opposite sides of said rod, dogs movably carried by, each `of said plates .engaging the teeth of said rod, said movable plates having openings therein, members transversely slidable in said plates-and'being prevented from 'verticalmovement therein, and means connected with'saidfframe including eccentrics operating in said meinbers. Y

`5. In ajack of the class Vdescribed a frame including side plates, a jack rod extending through and spaced between said side plates and having teeth at opposite sides thereof,

blocks slidable in vertical relation within the space between said plates lat opposite rsides. of said jack rod, dogs carried by said blocks engaging the teeth of said jack rod,

said blocks each having openings therein, pieces slidable across said blocks within said openings, shafts rotatably carried by said frameplates, eccentrics rfixed on said shafts .operating within openings provided in the pieces of said sliding blocks, and means 'for synchronously operating said shafts.

6. In a jack of the class described a frame including side plates, a jack rod extending through and spaced between said side plates and'havingfteeth at opposite sides thereof, blocks slidable in vertical relation within the space between said plates at opposite sides of said jack rod, dogs carried by said blocks engaging the teeth of said jack rod, said blocks each'k having openings therein, pieces slidable across said blocks within said openings, shafts rotatably carried by said frame plates, eccentrics fixed on said shafts operating within openings provided in the pieces of said sliding blocks, means for synchronously operating said shafts, and detentl means carried by the frame plates resiliently urged into engagement with the teeth of said jack rod.

ln a jack structure of the class'described a substantially U-shaped frame-including legs and a top cross beam, va jaclr rod extending upwardly between said legs and through said top beam, a frame carried by the legs of the first mentioned frame below the top beam, and eccentrically op erated dog means carried by said second mentioned frame for cooperation with the jack rod whereby to elevate the first mentioned frame thereon.

8.111 a jack a substantially U-shaped frame including a top beam and depending spaced legs, a stationary jack rod, a cross frame connected with said legs below the top beam, members slidable in vertical 'relation on said cross frame, dogs carried by each of said Amembers in engagement with said jack rod at opposite sides thereof, said members having openings upwardly therein, pieces slidable in said openings transversely of said members, said pieces having circular openings therein, shafts rotatable on the cross frame having eccentric discs on each operably disposed in the circular openings of said pieces, and means for moving said shafts together.

9. ln a jack a substantially U-shaped frame including a top beam and depending spaced legs, a stationary jack rod, a cross frame connected with said legs below the top beam, members slidable in vertical relationon said cross frame, dogs carried by each ofsaid members in engagement with said j ack rod at opposite sides thereof, saidL members having openings upwardly thereim pieces slida-ble in said openings transverse-I ly of said members, said vpieces having circular openings therein, shafts rotatable on the cross frames having eccentric discs on each operably disposed in the circular openings of said pieces, means for moving said shafts together, and detent means carried by the cross frame engaging said jack rod.

l0. In a jack structure of the class described a frame consisting of side brackets having channel pockets therein, plates connected with said brackets in spaced relation and rigid with said brackets, a jack rod being provided with teeth at opposite sides thereof slidably disposed through the space between the plates of said frame, blocks vertically slidable in a vdefined path in the space between the plates of said frame at opposite sides of said aclr rod, spring urged dogs carried by each of said plates urged into engagement with the teeth at the opposite sides of said rod, detent means resiliently urged into engagement with said jack rod teeth and being carried by said frame, shafts carried by the plates of said frame, eccentric discs on said shafts, and means connecting the eccentric discs of said shafts with the sliding plates of said frame whereby upon oscillation of the shafts the sliding pieces may be moved vertically in said frame, gears carried by said shafts in meshing relation, and a lever carried by one of said shafts.

LARS OLSEN THINGSTAD. 

